feat: add DFlash speculative decoding #274

Job	Run time
build_and_unit_test	13m 35s
speculative-decoding-eval	10m 15s
ssd-draft-memory-guard	1m 31s
dflash-speculative-decoding	11m 29s
speculative-decoding	9m 20s
integration_matrix (opencode)	3m 46s
integration_matrix (audio)	2m 53s
integration_matrix (server)	1m 25s
integration_matrix (vision)	1m 53s
integration_matrix (graph)	1m 14s
integration_matrix (omni)	2m 49s
	1h 0m 10s

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